With all that dark furniture I wonder if dark flooring would be a good idea, although I don't know how well dark furniture and a light floor would go together. You could always cover a large portion of the floor with a beautiful Oriental rug with colors that you love and then pull your bedding, pillow and drape colors from that. You could still have a white duvet and focus the color on the pillows. You could choose a soft, pale green for the walls and take that as your inspiration for rugs, drapes, etc. I do think some of these items should have patterns with added colors such as yellow, pale blue, green and a touch of pink or terracotta to add warmth. I would look for pictures on houzz and elsewhere for traditional bedrooms and that should give you wealth of ideas.

Doing a white shag rug and white sheets isn't mcm. hopefully you've got other decor items in mind? However, the rug would work (although I'd like a flat weave black and white one better) and I would turn it the other way, and pull it down from the top just a bit. please get some sheets that fit! lol these striped ones would look nice w/a white comforter here are some examples. play around w/some of the decor items in these pictures. notice how the bed is made and what is on the bed. pick one and copy it. I like the rug in this pic, below, the danish style chair, and the dresser. you could also get a gentleman's chest like this and paint the lower half black

Oops. The end table appears to be out of stock. I don't know if Overstock gets things back in stock, but here is the link: https://www.overstock.com/Home-Garden/Walnut-Finish-Modern-Chair-Side-End-Table/8182192/product.html?refccid=CNE7GQFJ5DTZZUCNON2FE4MOPE&searchidx=143 Here is a similar one (though quite a bit more pricey) from Crate & Barrel:

You may want to start saving inspiration rooms you love; it will really help if you have a direction. I would purchase the rug fist vs bedding and cushions so you have a style to build on. Be sure to use various colors, patterns and textures so it feels more interesting The headboard is high and I think art above each night stand would be more complimentary and use small brass lamps for a modern look. You could add the sign on another wall If you need a bedskirt, a more tailored style would feel more modern Dresser and tv wall - mirror, plant, chair, art, baskets